added instructions to compile gpio.erl and gpio_sup.erl, also added instructions to generate edoc for them
added instructions to generate doxygen documentation for gpio_port.c
putted start_link parameter in a tuple and changed arity from start_link/2 to start_link/1
first commit for gpio supervisor
fixed a copypasta error in documentation
fixed another copypasta error in documentation
first page commit
fixed double entry for docs
updated documentation
Organising docs.
Arranging docs.
updated app to generate edoc overview page
organising docs
Merge pull request #4 from ivaniacono/master

syncronizing repository
fixed compile errors
fixed compile errors
make sure ebin directory is created before compiling.